Is there a reliable website about artificial intelligence that is frequently updated?
For sites, https://towardsdatascience.com/ maybe a good choice. The articles on there is about AI. You can read a lot of articles about state-of-the-art AI networks there. You can also subscribe to their newsletter for emails everyday on new AI discoveries. However, as stated by @DuttaA, take the articles with caution. The articles may or may not be entirely true as they are written by the community. Choose articles with large number of likes to read. 

The YouTube channel two minutes paper is also a great resource. The channel posts videos about AI and also computer science periodically, and the content is easy to understand and enjoyable. 

Reminder: for the towards data science site, you should disable cookies for it so that there will not be a limit on how many articles you read. 

Hope I can help you and have a nice day